@polomi @Lucien_Lachance @WhiteWolf I'm doubtful this'll do anything, but try:
sudo eopkg install https://getsol.us/sources/amdgpu-test-2/linux-current-5.10.1-163-1-x86_64.eopkg http://mirrors.rit.edu/solus/packages/unstable/l/linux-firmware/linux-firmware-20201218-51-1-x86_64.eopkg
After this, just to make sure clr-boot-manager doesn't do anything dumb, run:
sudo clr-boot-manager update
Then reboot, select the 5.10.1-163, and let me know what happens (probably the same as before).